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Children whose parents smoke or vape cannabis appear to get slightly more respiratory infections, such as colds and flu, than those whose parents just smoke tobacco or don’t smoke at all.
The effect may come from children breathing in second-hand marijuana smoke, says Adam Johnson at Wake Forest School of Medicine in North Carolina. “It would make any [respiratory] virus more symptomatic because you have a child’s lungs being exposed to irritants.”
Children who breathe in second-hand tobacco smoke are known to have more respiratory illnesses, such as asthma, which has led some countries to ban people from smoking in cars with children present. But the effects of cannabis smoke exposure are less studied, especially as people tend to smoke fewer marijuana cigarettes per day than they do tobacco cigarettes.
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